Improvement in casting chilled mold-boards



w.rAL-L. Casting Chilled Mold-Boards.

Patented Feb. 17,1874.

v INVENTOR Mm af WI TJV ESSES Attorneys.

UNITED STATES PATENT FFICE.

IVILIIIAM BALL, OF BATTLE CREEK, MICHIGAN.

IMPROVEMENT IN CASTING CHILLED MOLD-BARDS.

Specification forming part of Letters Patent No. lflJSS, dated February17, 1874 application filed October 18, 1873.

i To all whom it may concern:

Beit known that I, WILLIAM BALL, of Battle Creek, in the county ofCalhoun and State of Michigan, have 'invented a new and valuableImprovement in Chilled Mold-Boards; and I do hereby declare that thefollowing is a full, clear, and exact description of the constructionand operation of the same, reference being had to the annexed drawingsmaking a part of this specification, and to the letters and figures ofreference marked thereon.

Figure 1 of the drawings is a representation of a sectional view of mydevice. Fig. 2 is a plan view of the same. Fig. 3 is a sectional, andFig. 4i a detail, view of the same.

This invention relates to an improvement in casting chilled mold-boardsforplows. It con-l sists in the employment of perforated or venteddry-sand cores, in combination with a castiron chillingplate for thepurpose of allowing a free escape of steam and gases from between thecasting and chill-plate, and therebyT preventing the casting fromwarping, as will be hereinafter explained.

The following is a description of 1n y improvement:

In the annexed drawing, A A represent the two parts composing the iiask,and B represents a cast-iron chill-plate, which corresponds in shape andsize to the shape and size ofthe mold-board C. This chill-plate ispermanently secured to the upper section A of the flask, and its topsurface is conca-ve, for a purpose hereinafter explained. a a arepresent drysand cores, which are inserted into holes made through thechillplate and arranged thereon, so as to leave the required bolt-holesthrough the finished casting. At or near the middle of the chill-platetwo or more holes are made through it, into which are inserted dry-sandcores b b, having rectangular ventholes o through them.

When the two parts ofthe ask are brought together, as shown in Fig. 3,and the metal is poured into the mold, the steam and gases which aregenerated between the melted metal and chill-plate are allowed to escapedownward into the sand in the part A through the ventholes c in cores b,as indicated by the arrows. The chill-plate B should be well heatedbefore the metal is poured into the mold, for which purpose the upperside of this plate is made concave, as above stated, and intothis basinmelted metal is poured. The vented cores b b, like the imperforate coresa, will leave holes through the casting, which I close by means of plugsthat are ground down flush with the wearing or chilled surface of themold-board in the process of grinding and smoothing this surface.

What I claim as new, and desire to secure by Letters Patent, is

Vented or perforated dry-sand cores b, combined with a chilling-plate,B, in molds for casting mold-boards for plows, to allow a free escape ofsteam and gases from between the casting and chill-plate. y

In testimony that I claim the above I have hereunto subscribed my namein the presence of two witnesses.

WILLIAM RALL. \Vitnesses 1 C. C. PEAVEY, GEORGE E. UIHAM.

